Climbing Forecast › Snowdonia — Ogwen › Tryfan (Heather Terrace & Grooved Arete)

SNOWDONIA — OGWEN · RHYOLITE

Tryfan (Heather Terrace & Grooved Arete) climbing conditions

Poor — wet, too windy or closed

Right now

Temp17°C
Wind12.4 km/h
Gusts16 km/h
Humidity95.67%
Rain 48h0mm
Last rainNone recent

Assessment

0.7mm rain forecast
Humidity 91% — potential fog

7-day forecast

Scroll through each day — hourly detail is shown inline.

Today Friday 14 August
Poor
Temp17°C
Rain0.7mm
Wind11 km/h
Gusts19 km/h
Humidity91%
0.7mm rain forecastHumidity 91% — potential fog
  • Wet rhyolite is slippery; seepage from grass above can linger
Time °C Rain Wind Gust Hum
06:00 17° 0mm 12 16 95.67%
09:00 18° 0mm 9 15 91.3%
12:00 18° 0.33mm 12 19 96.48%
15:00 17° 0.41mm 11 18 85.71%
18:00 16° 0mm 11 19 80.22%
21:00 14° 0mm 7 16 92.15%
Sat Saturday 15 August
Good
Temp15°C
Rain0.1mm
Wind15 km/h
Gusts26 km/h
Humidity67%
Should be dry
  • Good temperature for mountain rhyolite
Time °C Rain Wind Gust Hum
06:00 12° 0.11mm 12 23 95.19%
09:00 13° 0mm 16 28 82.85%
12:00 14° 0mm 15 26 69.62%
15:00 15° 0mm 15 26 64.21%
18:00 14° 0mm 13 23 69.85%
21:00 12° 0mm 5 13 87.45%
Sun Sunday 16 August
Good
Temp16°C
Rain0mm
Wind11 km/h
Gusts26 km/h
Humidity66%
Should be dry
  • Good temperature for mountain rhyolite
Time °C Rain Wind Gust Hum
06:00 10° 0mm 2 6 93.19%
09:00 12° 0mm 7 17 76.61%
12:00 15° 0mm 10 23 65.69%
15:00 16° 0mm 12 26 66.27%
18:00 16° 0mm 10 19 69.86%
21:00 14° 0mm 6 12 89.69%
Mon Monday 17 August
Poor
Temp17°C
Rain1.4mm
Wind15 km/h
Gusts31 km/h
Humidity81%
1.4mm rain forecast
  • Wet rhyolite is slippery; seepage from grass above can linger
Time °C Rain Wind Gust Hum
06:00 13° 0mm 7 15 95.01%
09:00 14° 0mm 12 25 87.05%
12:00 16° 0.25mm 15 31 81.71%
15:00 17° 0.4mm 15 31 80.79%
18:00 16° 0mm 16 32 87.07%
21:00 15° 0.75mm 17 33 96.79%
Tue Tuesday 18 August
Poor
Temp16°C
Rain10.1mm
Wind21 km/h
Gusts41 km/h
Humidity87%
10.1mm rain forecastHumidity 87% — potential fog
  • Good temperature for mountain rhyolite
  • Wet rhyolite is slippery; seepage from grass above can linger
  • Breezy — helps drying
Time °C Rain Wind Gust Hum
06:00 15° 1.48mm 18 36 97.94%
09:00 15° 1.55mm 20 38 95.6%
12:00 16° 1.45mm 21 41 89.85%
15:00 16° 1.15mm 21 41 84.91%
18:00 16° 0.85mm 17 33 84.58%
21:00 15° 0.74mm 14 26 92.95%
Wed Wednesday 19 August
Poor
Temp14°C
Rain3.6mm
Wind21 km/h
Gusts41 km/h
Humidity72%
3.6mm rain forecast
  • Good temperature for mountain rhyolite
  • Wet rhyolite is slippery; seepage from grass above can linger
  • Breezy — helps drying
Time °C Rain Wind Gust Hum
06:00 11° 0.5mm 14 27 95.1%
09:00 12° 0.62mm 19 36 87.13%
12:00 14° 0.61mm 21 41 74.13%
15:00 15° 0.4mm 21 41 70.18%
18:00 14° 0.35mm 17 33 76.7%
21:00 13° 0mm 12 24 90.68%
Thu Thursday 20 August
Poor
Temp14°C
Rain3.7mm
Wind18 km/h
Gusts39 km/h
Humidity75%
3.7mm rain forecast
  • Good temperature for mountain rhyolite
  • Wet rhyolite is slippery; seepage from grass above can linger
Time °C Rain Wind Gust Hum
06:00 10° 0.46mm 12 24 95.94%
09:00 12° 0.57mm 17 34 85.23%
12:00 13° 0.93mm 19 39 75.28%
15:00 14° 0.83mm 18 36 74.33%
18:00 14° 0.55mm 15 29 77.83%
21:00 12° 0mm 10 19 90.57%
Fri Friday 21 August
Good
Temp10°C
Rain0mm
Wind9 km/h
Gusts—
Humidity—
Should be dry
  • Good temperature for mountain rhyolite
Tryfan (Heather Terrace & Grooved Arete) is one of the most iconic mountain venues in Snowdonia, featuring rough, high-friction Ogwen volcanic rock. The dark rock is firm, featured, and offers excellent handholds, though mountain gullies and deep chimneys retain moisture following heavy fell rain. Facing east along the Heather Terrace, the cliff gets early morning sun before falling into shade, while its high mountain altitude over 700 metres exposes it to cold mountain winds. Grade coverage is heavily focused on classic lower-grade traditional scrambles and multi-pitch routes, epitomised by the legendary Grooved Arete. The approach involves a sustained, forty-five minute steep mountain hike from the Ogwen Cottage laybys along A5. Mountain weather changes rapidly at this altitude, making warm clothing, navigation tools, and helmets mandatory.

About Tryfan (Heather Terrace & Grooved Arete)

Tryfan (Heather Terrace & Grooved Arete) is one of the most iconic mountain venues in Snowdonia, featuring rough, high-friction Ogwen volcanic rock. The dark rock is firm, featured, and offers excellent handholds, though mountain gullies and deep chimneys retain moisture following heavy fell rain. Facing east along the Heather Terrace, the cliff gets early morning sun before falling into shade, while its high mountain altitude over 700 metres exposes it to cold mountain winds. Grade coverage is heavily focused on classic lower-grade traditional scrambles and multi-pitch routes, epitomised by the legendary Grooved Arete. The approach involves a sustained, forty-five minute steep mountain hike from the Ogwen Cottage laybys along A5. Mountain weather changes rapidly at this altitude, making warm clothing, navigation tools, and helmets mandatory.

Region
Snowdonia — Ogwen
Rock type
rhyolite
Aspect
east-facing
Altitude
700m
Exposure
high
Seepage
medium

Other crags in this region

Glyder Fach (Main Cliff)